The System Design Of Pulsed Power Supply Based On HTS Magnetic Energy Storage

Pulsed power technology is an emerging multidisciplinary discipline, which is widely used in national defense, industry and civilian fields. The pulsed power technology specitific goal is:improve the power of energy density, development of high power switches and product high repetition frequency pulse. Superconducting pulsed power technology has specific characteristics such as long storage time, no energy loss and light weight. All these charactical meet the requirements of miniaturization, integration and practical utility for the future works. But as the inductive energy storage pulsed discharge mode, still need to improve the discharge mode, the circuit breaker and protection circuits to improve system performance. This paper was aiming at the pulsed power design in electromagnetic propulsion application, combining with the traditional discharge mode, putting forward two kinds of superconducting magnetic energy discharge mode, manufactured a high temperature superconducting pulsed transformer and did some experiments about pulse shaping.Firstly, this paper made the theoretical analysis of the capacitive energy storage and superconducting magnetic energy storage to drive the electromagnetic propulsion load, found the theory feasibility of the two storage mode directly contributing to rail propulsion and the relationship between the energy loss and the circuit. By using the enhanced current model of pulse transformers it can overcome the low efficiency, many parallel modules and the load matching problem with direct promotion load. Then, the paper analyzed the discharge mechanism of low temperature superconducing (LTS) pulse transformer discharge mode, introduced the high temperature superconducing (HTS) pulse transformer discharge power supply. According to the circuit breaker overvoltage problem, our group proposed three intermediate conversion circuits, including linear resistor, non-linear resistor and capacitor. In this paper, simulation of the intermediate conversion circuits on the circuit breaker overvoltage protection, pulse output and energy transfer efficiency.Then, this paper introduced a new superconducting inductor-capacitor hybrid energy pulsed power discharge mode, and as a power for rail electromagnetic propulsion load. This discharge mode which inductor and capacitor sharing an initial power increase the energy storage capacity further limit switch voltage peak value, and introduces the energy recovery system.The theoretical and simulation results show that the hybrid energy storage pulsed discharge model can effectively inhibit high voltage across opening switch and improve efficiency of the entire system. In order to verify the feasibility of the hybrid energy storage pulsed discharge mode, manufactured a small high temperature superconducting pulsed transforme, and compared the performance of two kinds of connection mode, the experimental results proved that the feasibility and principle of designing a new type of dischargemode. Finally, in order to reduce the design complexity of the parallel of superconducting pulsed power transformer, combined with cryogenic IGBT and ZnO varistor technology,proposed the whole cryogenic superconducting magnetic energy storage pulsed power supply transformer type. Then, this paper made a experimental and theoretical analysis of the cryogenic electrical characteristics of the device and quench protection circuit. In order to verify the feasibility of the new module, our group design a whole cryogenic superconducting magnetic energy storage pulsed power transformer, on the basis of the theory study to establish a joint simulation of Simplorer and Maxwell, and put forward relevant control measures for the circulation problem.The power supply is made up of the upper and lower mutual coupling SMES pulsed power transformer modules, charging in series-parallel discharge technology, the initial stored energy in 80A current, the load got 5.42kA pulse current. Two kinds of SMES pulse discharge mode which proposed in this paper are meet the requirements of the miniaturization of practical of the pulse power supply, and engineering practice for the future design of a higher power level SMES pulsed power supply.